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Schedule III. Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Policy Acquisition Costs $ 633,521 $ 663,991 $ 476,661
Future Policy Benefits, Losses, Claims and Loss Expenses 10,381,138 9,384,349 6,076,271
Unearned Premiums 2,763,599 2,530,975 1,716,021
Premium Revenue 3,952,462 3,338,403 1,976,129
Net Investment Income 354,038 424,207 269,965
Benefits, Claims, Losses and Settlement Expenses 2,924,609 2,097,021 1,120,018
Amortization of Deferred Policy Acquisition Costs 897,677 762,232 432,989
Other Operating Expenses 206,687 222,733 178,267
Net Written Premiums 4,096,333 3,381,493 2,131,902
Property      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Policy Acquisition Costs 118,327 79,795 66,656
Future Policy Benefits, Losses, Claims and Loss Expenses 4,371,745 4,073,850 3,086,254
Unearned Premiums 659,236 539,183 379,943
Premium Revenue 1,936,215 1,627,494 1,050,831
Net Investment Income 0 0 0
Benefits, Claims, Losses and Settlement Expenses 1,435,735 965,424 497,895
Amortization of Deferred Policy Acquisition Costs 353,700 313,761 177,912
Other Operating Expenses 135,547 139,015 112,954
Net Written Premiums 2,037,200 1,654,259 1,055,188
Casualty and Specialty      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Policy Acquisition Costs 515,194 584,196 410,005
Future Policy Benefits, Losses, Claims and Loss Expenses 6,008,685 5,310,059 2,985,393
Unearned Premiums 2,104,363 1,991,792 1,336,078
Premium Revenue 2,016,247 1,710,909 925,298
Net Investment Income 0 0 0
Benefits, Claims, Losses and Settlement Expenses 1,488,662 1,131,637 622,320
Amortization of Deferred Policy Acquisition Costs 543,977 448,678 255,079
Other Operating Expenses 71,140 84,546 64,883
Net Written Premiums 2,059,133 1,727,234 1,076,714
Other      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred Policy Acquisition Costs 0 0 0
Future Policy Benefits, Losses, Claims and Loss Expenses 708 440 4,624
Unearned Premiums 0 0 0
Premium Revenue 0 0 0
Net Investment Income 354,038 424,207 269,965
Benefits, Claims, Losses and Settlement Expenses 212 (40) (197)
Amortization of Deferred Policy Acquisition Costs 0 (207) (2)
Other Operating Expenses 0 (828) 430
Net Written Premiums $ 0 $ 0 $ 0